Write more stable tautomeric structrues of the following:
(a) Phenol
(b) Methyl-3-oxobutane
(c )Cyclohexan -1,3,5 trione

Explanation

a.
b.
c.
d.
(II is less stabel, the exocyclic `(C==C)` bond increases the strain in the cyclopropyl ring.)
The `(C==C)` bond joining two rings is called exocyclic double bond.